Use of melamine in the nitridation of aluminum oxide to aluminum nitride

Jung, Woo‐Sik

doi:10.2109/jcersj2.119.968

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…indicated that δ‐Al 2 O 3 converted to AlN without δ‐α alumina transformation. The change in XRD patterns with calcination temperatures was similar to that when using CH 3 CN or melamine except that the sample at 1000°C showed intense AlN peaks.…”

Section: Resultssupporting

confidence: 57%

“…The gases evolved at 900°C were NH 3 , HCN, and CO, while the gases evolved at 1200°C were HCN and CO. These gases were also observed for the nitridation of Al 2 O 3 using melamine . The CO gas would be evolved by the reaction between δ‐Al 2 O 3 and thermal decomposition products of PCN at the hot zone.…”

Section: Resultsmentioning

confidence: 83%

“…The HCN formed by the reaction of a mixed N 2 ‐H 2 gas with carbon was also used for the nitridation of Al 2 O 3 . Recently, organic compounds such as CH 3 CN and melamine, which yield HCN by the thermal decomposition, were employed as nitridation reagents in the conversion of Al 2 O 3 to AlN …”

Section: Introductionmentioning

confidence: 99%

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Conversion of Alumina to Aluminum Nitride Using Polymeric Carbon Nitride as a Nitridation Reagent

Jung

2016

J. Am. Ceram. Soc.

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Polymeric carbon nitride, which was synthesized by polymerization of dicyandiamide at 500°C, was used as a nitridation reagent in the conversion of d-alumina (d-Al 2 O 3 ) to aluminum nitride (AlN). The products obtained at various reaction temperatures were characterized by powder X-ray diffraction, 27 Al magic-angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). d-Al 2 O 3 began to convert to AlN at 900°C, which is the lowest temperature reported for the formation of AlN from Al 2 O 3 , and completely converted to AlN at 1400°C. The occurrence of reaction intermediates during nitridation was confirmed by 27 Al MAS NMR and XPS. The change in Raman spectra with reaction temperatures indicated that lattice defects in AlN were reduced by calcining at higher reaction temperatures.

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Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 83%

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Conversion of Alumina to Aluminum Nitride Using Polymeric Carbon Nitride as a Nitridation Reagent

Jung

2016

J. Am. Ceram. Soc.

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“…However, the raw material itself has abundant oxygen elements. Therefore, melamine (C 3 H 6 N 6 ) was additionally injected into the thermal plasma jet to prevent the oxidation of decomposed Ga into Ga 2 O 3 [ 21 , 22 ]. In order to improve the crystallinity of synthesized GaN, products from the thermal plasma were subjected to annealing using a vacuum furnace.…”

Section: Introductionmentioning

confidence: 99%

Thermal Plasma Synthesis of Crystalline Gallium Nitride Nanopowder from Gallium Nitrate Hydrate and Melamine

2016

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Gallium nitride (GaN) nanopowder used as a blue fluorescent material was synthesized by using a direct current (DC) non-transferred arc plasma. Gallium nitrate hydrate (Ga(NO3)3∙xH2O) was used as a raw material and NH3 gas was used as a nitridation source. Additionally, melamine (C3H6N6) powder was injected into the plasma flame to prevent the oxidation of gallium to gallium oxide (Ga2O3). Argon thermal plasma was applied to synthesize GaN nanopowder. The synthesized GaN nanopowder by thermal plasma has low crystallinity and purity. It was improved to relatively high crystallinity and purity by annealing. The crystallinity is enhanced by the thermal treatment and the purity was increased by the elimination of residual C3H6N6. The combined process of thermal plasma and annealing was appropriate for synthesizing crystalline GaN nanopowder. The annealing process after the plasma synthesis of GaN nanopowder eliminated residual contamination and enhanced the crystallinity of GaN nanopowder. As a result, crystalline GaN nanopowder which has an average particle size of 30 nm was synthesized by the combination of thermal plasma treatment and annealing.

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Hydrogenation of Pyridines Using a Nitrogen‐Modified Titania‐Supported Cobalt Catalyst

Chen

Sahoo

et al. 2018

Angewandte Chemie

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Novel heterogeneous catalysts were prepared by impregnation of titania with as olution of cobalt acetate/ melamine and subsequent pyrolysis.T he resulting materials show an unusual nitrogen-modified titanium structure through partial implementation of nitrogen into the support. The optimal catalyst displayed good activity and selectivity for challenging pyridine hydrogenation under acid free conditions in water as solvent.

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Use of melamine in the nitridation of aluminum oxide to aluminum nitride

Cited by 11 publications

References 18 publications

Conversion of Alumina to Aluminum Nitride Using Polymeric Carbon Nitride as a Nitridation Reagent

Conversion of Alumina to Aluminum Nitride Using Polymeric Carbon Nitride as a Nitridation Reagent

Thermal Plasma Synthesis of Crystalline Gallium Nitride Nanopowder from Gallium Nitrate Hydrate and Melamine

Hydrogenation of Pyridines Using a Nitrogen‐Modified Titania‐Supported Cobalt Catalyst

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